Q: What is common to the places called 'Aliyar, Idukki, Mettur, Parambikulam'?
(a)Buddhist archaeological sites
(b)Underground cave systems
(c)Pre-historic cave paintings
(d)Water reservoirs
Correct Answer: (d)
The correct answer is (b) 'Underground cave systems'. This question from the Ancient History domain tests knowledge of Buddhism & Jainism.